Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image in a sequence for a displayscreen or portion thereof with transitional graphical user interfaceaccording to our design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof;

FIG. 5 is a front view showing a fifth image thereof;

FIG. 6 is a front view showing a sixth image thereof;

FIG. 7 is a front view showing a seventh image thereof;

FIG. 8 is a front view showing an eighth image thereof;

FIG. 9 is a front view showing a ninth image thereof; and,

FIG. 10 is a front view showing a tenth image thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-10. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

The broken lines showing portions of the display screen and all otherbroken lines showing portions of the graphical user, interfaceillustrate portions of the article and form no part of the claimeddesign.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.